Meet the Ice Age Giants

"This is a skull of a Smiladon, a big cat that was larger than an
African lion, an absolutely formidable creature. When you look at the
skeletons... they’re chilling. They've got these incredible, sabre teeth
which were their canines and were about seven inches long. When you feel
them, they’ve got fine serrations all the way down the back of the teeth, a
little bit like a steak knife."